Regenerative reversing furnace.



L. L. Knox. REGBNERATIVB BEVERSING FUBNAGE.

APPIJIOATION ITLED HAY 14, 1908.

Patented A111220, 19W,

5 SHEETS-SHEET L WITNESSES L. L. KNOX.

TIVE REVERSING FURNACB.

APPLICATION FILED MAY 14, 190s.

Patented Apr. 20, 1909.

5 SHEETS-SHEET 2.

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L. L. KNOX.

REGBNERATIVE RBVERSING FURNAGE.

APPLIOATION FILED MAY 14, 190B. 919, 185, l Patented A111220, 1909.

5 SHEETS-SHEET 3.

WF'MESSES NITED sTATns PATENT onirica.

LUTHER L. KNOX, OF IBEN AVON, PENNSYLVANIA, ASSIGNOR TO KEYSTONE FURNACE CONSTRUCTION COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF Pl-TTTRL SYLVANIA.

Specification of Letters Patent.

Patented April 20, 1909.

Application led May 14, 1908. Serial` No. 432,867.

To all whom it may concern:

Be it known that I, LUTHER li. KNOX, of`

Ben Avon, 'Allegheny county, Pennsylvania, have invented a new and useful Imu proveinent in Regenerative Reversing Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is an end elevation, showing one form of l'urnace embodying my invention;

Fig. 2 is a vertical section on the line'II-II oiFig. l, Fig. 3 is a plan vlew partly broken My invention has relation to regenerative reversing furnaces and is designed to provide means of novel and effective character for protecting the arch which separates'the gas and air ports ,z also to provide a novel construction of arch which can be readily removed and replaced when necessary; and also to provide means oi improved character for protecting the front walls of the gas ports from the destructive action ol' the hot gases.

The precise nature oil my invention will be best understood by reference to the accom- -panying drawings, in which I have shown Awith the interior ot' the furnace through the The an ports 4 lead up# arched passages 3. wardly at the sides of the .furnace and cornrnunicate. therewith by means ol' the passage'5. My invention is largely concerned with the construction oithe arch which separates the tWo passages 3 and 5. This arch consists et' an arrangement of metallic cooling boxes, one iorm. ot' which is shown in Fig. 3, and which support an upper layer 6 oil bricks or other refractory material, which constitutes the floor of the passage 5, and also an arch 7 of firebrick or other refractory material, which forms the roeiI of the gas passage 3. In the forni el" furnace shown in Figs. l and 2, I prefer to forvn a separate arch of this character for each or" the gas ports or lues.

As shown in Figs. 3 and 4, the cooling boxes in each arch comprise hollow side portions 8,

,with a plurality of transverse hollow connections 9, which may be secured to the side portions in any convenient manner. For this purpose, I have shown the closed end portions of these transverse boxes as having seats 10, to receive screws or bolts 11, which extend through interior bosses l2, within the side portions 8, and whose heads are seated in the countersinks 13, in the outer faces Yof said' side portions. 'By this arrangement, the bolts are surrounded and protected by the water. In the arrangement shown in Fig. 3, each of the transverse boXes,eXcept that at the inner end, is provided with an intermediate baiiie 14, dividing its interior into two separate portions, each of which has therein a baille l5. Adjacent boxes are connected by pipe connections 16, and the circulation of the water through the several boxes and their different compartments may be readily traced by the arrows on Fig. 3, without further detaill description thereof. The hollow side portions 8 are also provided with circulating connections 17, as shown in Fig. 1. These connections 17 together with the inlet connections 18 for the transverse boxes may be all supplied by connection with the main supply pipes 19. 21 designates the outlet oar discharge pipes for the side memlbers 8 and 22 designates the discharge connections for the transverse boxes.

For the purpose ci' supporting the lower arch 7, each of the side members 8 is formed with a downward extension 8, having beveled inner faces which carry the arch. In the modification shown in Fig. 5, the side portionsy 8b are extended. downwardly in` thm forni of water legs 8c, having each a foot pom.l tion Sd to carry the side Walls 23 ol: the flue or passage 3. y i

The entirev arch is removably supported upon the side walls of the furnace and rests upon the front Walls 24, and be Withdrawn from the furnace and entirely replacedy when necessary. To permit this, the front wall a of the flue .5 is formed with an arch 5b, extending transversely over the cooling arch. Below this arch 5b, the space is lled vin with bricks 5C, which can be readily removed. lThe transverse cooling boxes of the arch "are preferably formed with inclined side Walls, as best shown in Fig. 2, for the purpose of forming hey-shaped spaces to retain the intervening brichwork.

Fig. @shows a modified forni of the cool ing boxes in which the'Water-circulating connections are somewhat differently arranged.

v T he Water circulation is indicated by the arrows, and it will be understood Without detail description, the general arrangement and construction of the boxes, aside fromthc interior of the baffling and the circulating connections, being the saine as that shown in Figs. 3 and fl.

Figs. 7 and S snow another modification in which there a number of transverse cooling boxes 2G, which are, in turn, connected by longitudinally arranged cooling boxes 27, preferably cast integrally therewith, these latter also having inclined lateral Walls 27, for the purpose of keying the inset bricl work therein. l also preferab y provide the front vvall 2a of the gas port 2, with a plurality of cooling boxes 2S, which are preferably set into such Wall. As shown in Fig. 1, an arch 29 is built over each of these boxes and the boxes are each capable of removal from the arches, should they become bui-ned out. Each of these boxes 2S is preferably connected with a supply pipe 30, by an inlet pipe 3i, and an outlet pipe 32, having respectively the valves 31 and 32. The supply pipe 30 also has a valve a between each pair of connections 31 and 32. By this -ar rangement ofpipes and valves, Water can be shut out of any box of the series, to permit it to be removed without disturbing the circulation iii the other boxes. For this purpose, the vaious circulating pipe .connections are provided with detachable unions or connections. Each of the boxes -is provided with suitable interior bafliing 33, to provide for acomplete water circulation therethrough. As shown in Fig. l, the cooler water enters each box at its lowest point and leaves said box at its highest point, thereby providing for a continual ascending circulation through the series of boxes. The various discharge ipcs of the Water-circulating systems may be arranged to discharge at any -desired point'. ln Figs. i and 9, I have shown them as being arranged to discharge into a trough or receptacle 88, their discharge ends having open nipples 39, which will permit of the escape of any steam which may form in the pipes. This arrangement will also prevent siphoning of the Water from the systems.

Figs. 9 and 10 show the application of my invention to a furnace having single central @as )ort 34. This as ort communicates C with the interior of the furnace by the passage 35. 3G designates the air inlet, and 37 is the arch which separatesthe gas and air inlet passages. 'This arch is removable and is of the same construction as that of Figs. l, 2, 3 and 4. The front Wall of the poit 34 is provided with a series of inset cooling boxes 35. As shown, these are flat boxes which are set into the Wall of the furnace. circulation through these boxes is effected by means of the connecting pipes 40, which are arranged in a similar manner to those for the boxes 2S of Fig. l, so as to permit the water to be shut out from any box, Without disturbing the 'circulation through the other boxes.

My invention provides for complete Water circulation through those portions of the furnace Walls which are most exposed to the destructive action of the hot gases, While at the saine time, the walls are not cooled to an extent which will chill the incoming air' and Yfas. n

rlhe arch between the gas and air ports may be thoroughly cooled by Water circulation through the unclosed cooling boxes, thus greatly extending the life of these arches, and should they eventually become burned out they can be readily removed and replaced, the entire arch being removable as a unit, the cooling members being arranged to carry and support the entire brickvvorh of the arch. The provision of the cooling boxes in the front Walls of the gas ports effectually protects these walls from the burning out by the hot directed against them When the furnace is reversed. It will be understood that the ports at both ends of the furnaces are provided With a similar removable arch, and with similar cooling means to those which l. have shown and described in connection with one end of the furnace.

IVarious changes may be made .in my invention. Thus, the Watercooling boxes Within the arch may be constructed and connected in various other Ways 'than those described; the interior baffling and the arrangement of the Water-circulating pipes may be largely varied, and other changes in details may be made.

Nhat l claim is:

1. In a regenerative reversing furnace, a removable arch separating the gas and air ports, said arch comprising hollow metallic side members and transverse hollow inembers, Water-circulating connections for the side and transverse members, andan upper refractory covering for said members carried thereby, and a lower refractory arch carried by said side members, substantially as de scribed.

2. In a furnace ofthe type described, an

Cir

The Vwater arch separating the gas and air ports, said arch having hollow metallic side members, transverse hollow members connected to the side members, and water-circulating connections for the side and transverse members, substantially as described.

3. In a furnace of the character described, an arch separating the gas and air ports, said arch having hollow metallic side members supported on the side Walls of the furnace, transverse members connected to the side members, Water-circulating connections for the side members, Water-circulatin connections between the transverse mem ers, and' briclrwork supported by said side and transe verse members and constituting theupper and lower surfaces of the arch, substantially as described.

4. In a furnace of the character described,

an arch separating the gas and air ports, said4 arch having longitudinally extending hollow metallic members supported onv the Walls of the furnace and havlng downward extensions, ,transverse water boxes secured to andl extending between the side members, watercn'culatin vconnections for the side members and for t e .transverse boxes, a refractory body supported upon and betweenv the side members and the transverse boxes, and a lower refractory arch supported by the downward extensions of the side members,

extending between the side membersjwaterv circulatin connections for the side members and for t e transverse boxes, a refractory body supported upon and between the side members and the transverse boxes, and a lowerv refractory arch supported by the downward extensions of the side members, said arch being bodily insertible into and removable from the furnace, substantially as described. e

In testimony whereof, l have hereunto set my hand.

LUTHER L. KNOX. Witnesses:

H..M. CORWIN, GEO. H. PARMELEE. 

